Document Detail

Effect of concentrate feed level in late gestation on subsequent milk yield, milk composition, and fertility of dairy cows.
MedLine Citation:
PMID:  11417707     Owner:  NLM     Status:  MEDLINE    
The effects of level of concentrate feeding in late gestation on feed intake, milk yield, milk composition, and fertility in the subsequent lactation were evaluated in a randomized block design experiment involving 60 cows. Grass silage was offered ad libitum for the last 28 d of gestation either as the sole diet (OC) or supplemented with 5 kg/d of concentrates (5C). Following calving, the cows were offered the same grass silages supplemented with 7 kg/d of concentrates. For treatments OC and 5C, total dry matter intakes were 9.28 and 11.03 kg/d of dry matter, respectively, during the last 4 wk of gestation. During wk 1 to 12 of the subsequent lactation, treatment 5C increased milk fat concentration but did not alter feed intake, milk yield, or protein concentration relative to treatment OC. Treatment 5C increased the interval to first progesterone rise and the number of services per conception relative to treatment OC. Cow parity, BF depth assessed at d 28 before parturition, and treatment provided the best fit relationships for the yields of fat and fat plus protein (R2 relationships = 0.65 and 0.64, respectively) during wk 1 to 4 of lactation. It was concluded that, other than milk fat concentration, supplementation with additional concentrates in late gestation did not alter milk yield or composition and dairy cow fertility. Furthermore, despite the very large differences in cow characteristics at d 28 before parturition, there was no evidence of any interaction between treatment and specific cow characteristics on animal performance in the first 12 wk of lactation.
T W Keady; C S Mayne; D A Fitzpatrick; M A McCoy
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  84     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-06-21     Completed Date:  2001-11-01     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1468-79     Citation Subset:  IM    
Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down.
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MeSH Terms
Animal Feed
Animal Husbandry
Animal Nutritional Physiological Phenomena
Cattle / physiology*
Dietary Supplements
Energy Intake
Fertility / physiology*
Lactation / metabolism*
Lipids / analysis
Milk / chemistry*
Milk Proteins / analysis
Pregnancy / metabolism*
Time Factors
Reg. No./Substance:
0/Lipids; 0/Milk Proteins

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